I guess I'm asking because there have been times that my energizers don't charge anymore and I wouldn't consider them old. I think about how much those things cost whenever that happens.
May style kami sa mga bateryang hindi na mag-charge.... You have to "shock" them by applying >5V for a 1.2V (1.5V) battery for a short duration of time. Almost all of the time, they recover.... Just make sure that you connect the terminals properly...